How to do copy/paste function programmatically in iphone?

To copy from a button click:

- (IBAction)copy {
    UIPasteboard *pb = [UIPasteboard generalPasteboard];
    [pb setString:[textView text]];
}

To paste from a button click:

- (IBAction)paste {
    UIPasteboard *pb = [UIPasteboard generalPasteboard];
    textView.text = [pb string];
}